Why not have the owner of the MG do it? As a Post Sample, it's either already in a dealer/manufacturer's inventory or belongs to a PD. The trouble with Posties is transferring them to another dealer, you can't do that without one of their local PDs giving them a letter stating they want a demo of that model MG. There is no other provision for transferring them between dealers, except temporary ones for repair and such. Destruction, since there is no gun to return, would qualify? If the owner can't do it, the only alternative would be to have a local guy do the job while the owner is present, no transfer.

I think destruction might qualify as a "service" similar to repair and / or service, so a temporary transfer might be alright. I remember there was somebody that had some (two?) FN Minimi's cut to his specs in Canada and imported the demilled parts to the US to weld back together. His cutting specs of course were to make it easiest to weld back together and to be legal to import.